OG User Roles and OG Forum

TAC/OG Integration
OG User Roles no longer (as of release 5.x-2.4) requires installation of the OG Forum module. However, TAC/OG Integration does require that the og_forum.module be installed.

Group Forum Management
If you wish a group user to be able to manage group forums, you mus:

• Assign the user a group role which has the the "Administer forums" permission.
• Make the user an OG "administrator" for the group.

If one or the other of these isn't done, then the user won't see the "Manage group forum" link on the group home page. See: http://drupal.org/node/173357

Also note internal changes made to both modules in order for them to work together: http://drupal.org/node/156568